Re: [PULL 00/53] Misc patches for QEMU 5.1 soft freeze

[Paolo Bonzini]

On 08/07/20 18:45, Claudio Fontana wrote:
> C++ is used to link the final qemu-system binary and on my system c++ has LTO:
> 
> c++ -v
> Using built-in specs.
> COLLECT_GCC=c++
> COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/7/lto-wrapper
> OFFLOAD_TARGET_NAMES=hsa:nvptx-none
> Target: x86_64-suse-linux
> Configured with: ../configure --prefix=/usr --infodir=/usr/share/info
> --mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
> --enable-languages=c,c++,objc,fortran,obj-c++,ada,go
> --enable-offload-targets=hsa,nvptx-none=/usr/nvptx-none,
> --without-cuda-driver --enable-checking=release --disable-werror
> --with-gxx-include-dir=/usr/include/c++/7 --enable-ssp --disable-libssp
> --disable-libvtv --disable-libcc1 --disable-plugin
> --with-bugurl=https://bugs.opensuse.org/ --with-pkgversion='SUSE Linux' 
> --with-slibdir=/lib64 --with-system-zlib --enable-libstdcxx-allocator=new 
> --disable-libstdcxx-pch --enable-version-specific-runtime-libs 
> --with-gcc-major-version-only --enable-linker-build-id --enable-linux-futex 
> --enable-gnu-indirect-function --program-suffix=-7 --without-system-libunwind 
> --enable-multilib --with-arch-32=x86-64 --with-tune=generic 
> --build=x86_64-suse-linux --host=x86_64-suse-linux
> Thread model: posix
> gcc version 7.5.0 (SUSE Linux) 
> 
> 
> I checked cc but did not think to check c++ . I will find a way to disable 
> this thing and will correct the patch accordingly.

Having LTO support is not the same thing as having it enabled.  Are you
compiling and linking with "-flto"?

Paolo